All NJS Light Weight build

Just how light, or heavy, is an all-NJS keirin track bike build? We had often wondered this, and finally had a chance to find out. As you may know there are no carbon parts in Japanese keirin racing, and titanium is hardly used, either, so this is a proper old-school track bike, although everything you…

NJS-approved rims from Araya and Ukai.

The only current rim (リム=re-mu) used in keirin track racing in Japan is the 16B Gold, manufactured by Araya Kogyo in Osaka, Japan. This, like any previous NJS-approved rim is a 36 hole tubular 700c size rim. Professional keirin racers glue-on their tires, but for the street or even amateur track use we often use…

The NJS-approved parts bible.

Known by few and possessed by even fewer, this is our copy of the Parts guide published by the JKA. It provides Japanese professional keirin racers, parts manufacturers, frame builders and mechanics with a complete reference guide to what parts can be used in keirin racing in Japan. These parts are often referred to as…

Dating Japanese track bike frames – serial numbers.

Below are a couple of photos of the underbellies of Japanese NJS track frames. The bottom bracket shell usually has some numbers roughly stamped in which give the builder (and us) a reference of what the frame is. Builders have their own unique ways of numbering frames and usually keep records of all of the…